I've been searching this forum for the last few days and think I have pinned down how to describe what is going on with my newly acquired '83 300SD with 288k mi.

At start-up, she purrs like a kitten. After she warms up, she shudders at idle speeds. I can feel it once the RPM's drop to under 1K, the engine starts to fluctuate up and down.

I've been told and read that it is something to do with the rack dampner bolt, valve adjustments(which was just done 50mi. ago) and possibly the injectors.

She does not smoke and drives VERY well aside from this little hiccup.

This is my first Mercedes and my first post in this forum.

Hello all!